Find hte sum of series

  • Thread starter rcmango
  • Start date
  • #1
rcmango
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Homework Statement



heres the equation: http://img255.imageshack.us/img255/1669/untitledfa5.jpg [Broken]

Homework Equations



i think we use cos(x)

The Attempt at a Solution



i know that cos(x) = cos(pi)

so the limit is -1?

whats the sum, I'm a bit confused.
must be in simplest form
what must i show. help.
 
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Answers and Replies

  • #2
Dick
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I don't think you can express the sum much more simply than -1. The 'limit' you are talking about is the 'sum', right?
 
  • #3
arildno
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What you must show is that the infinite series representation of [itex]\cos(\pi)[/itex] is identical to the infinite series given in the exercise.
 
  • #4
rcmango
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excellent, okay you its simple it is only -1. I just wasn't sure what they wanted to see. thanks
 

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